I have fairly short arms even for my 5 foot tall frame, the yoga block helps me achieve the intended stretch in some poses by giving me that extra little boost, when I was shopping for my yoga mat I only bought one, but I plan to go back and get another, also a band.
By waiting a bit, and shopping around, I was able to get a cork brick/block on sale for less than $10, cheaper than some foam bricks! And I've seen foam ones on sale as well. Even "used" ones can be bought cheaply - if you are squeamish about "germs", just scrub it gently with mild soap and water (cork or foam).
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